Left: 1 cm benign-appearing polyp on a short stalk, in a 61 year-old woman evaluated for occult bleeding. The carcinoma was confined to the head of the polyp, and was completely excised by polypectomy.
Center: 60 year-old woman with rectal bleeding. View from above this complex tubulovillous polyp with both sessile and pedunculated components, containing carcinoma without invasion.
Right: 1 cm sessile polyp in a 70 year-old man undergoing colonoscopy for occult bleeding. The lesion was injected submucosally with saline, then excised with a snare using electrocautery. Though grossly benign in appearance, the lesion contained carcinona-in-situ; snare polypectomy was therefore curative.
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